2021021650 has 12 divisors (see below), whose sum is σ = 3759100362. Its totient is φ = 808408640.

The previous prime is 2021021627. The next prime is 2021021663. The reversal of 2021021650 is 561201202.

It can be written as a sum of positive squares in 3 ways, for example, as 1054495729 + 966525921 = 32473^2 + 31089^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 20210167 + ... + 20210266.

Almost surely, 2^2021021650 is an apocalyptic number.

2021021650 is a deficient number, since it is larger than the sum of its proper divisors (1738078712).

2021021650 is a wasteful number, since it uses less digits than its factorization.

2021021650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40420445 (or 40420440 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 2021021650 is about 44955.7743788270. The cubic root of 2021021650 is about 1264.3199435945.

Adding to 2021021650 its reverse (561201202), we get a palindrome (2582222852).

The spelling of 2021021650 in words is "two billion, twenty-one million, twenty-one thousand, six hundred fifty".